ScubaKimmie:Yet you posted to it
I've used them a few times, mostly in a cavern that I'm not going very deep into or under a kelp canopy. While a 19 30 or 40 might give you lots of extra air you don't always need that much air to get out of trouble. I breathe fairly well and at 50 feet I"ll have plenty of air to get to the surface without the need to ditch weights.
On the other hand I've never needed it. It's not a waste but it isn't always necessary either.
:balloon - Hey SK - I used to live near Kaiser Hosp in South SJ - last time I went back to SJ was in 2003. sure did change ALOT since I moved in '97 - I know this is off topic but it's my thread.....fftopic: LOL!!